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doi: and isbn: are both URN schemes, as far as I know.

For example

"urn:isbn:0-486-27557-4 "^^xsd:anyURI
On Tue, 19 Feb 2019 at 16.52, Tim Thompson <[log in to unmask]> wrote:

> Thanks, Jeff--I was just about to point to the Wikidata approach as well.
> Isolating the uniquely identifying component from the IRI allows for
> greater flexibility and supports persistence: a formatter URL can be
> supplied (and potentially changed when needed) to dereference the
> identifier as an IRI and potentially include that in serialized output [1].
>
> Tim
>
> [1] https://www.wikidata.org/wiki/Property:P244#P1921
>
>
> --
> Tim A. Thompson
> Discovery Metadata Librarian
> Yale University Library
>
>
> On Tue, Feb 19, 2019 at 10:39 AM Young,Jeff (OR) <[log in to unmask]> wrote:
>
>> I like how Wikidata deals with this in their RDF. Each identifier scheme
>> gets its own property, which can then be described in various ways. For
>> example:
>>
>>
>>
>> https://www.wikidata.org/wiki/Property:P244
>>
>>
>>
>> When you go to use that property as an external ID on items, which allows
>> you to elaborate on that specific identifier using qualifiers, such as here:
>>
>>
>>
>> https://www.wikidata.org/wiki/Q963044#P434
>>
>>
>>
>> Jeff
>>
>>
>>
>> *From: *Bibliographic Framework Transition Initiative Forum <
>> [log in to unmask]> on behalf of Simeon Warner <
>> [log in to unmask]>
>> *Reply-To: *Bibliographic Framework Transition Initiative Forum <
>> [log in to unmask]>
>> *Date: *Tuesday, February 19, 2019 at 10:24 AM
>> *To: *"[log in to unmask]" <[log in to unmask]>
>> *Subject: *Re: [BIBFRAME] When a bf:Identifier is a URI
>>
>>
>>
>> I agree with Lars on both counts. An unquoted URI in RDF does not stand
>> for the identifier, it stands for the resource. Thus, ugly as it is,
>> there is no option except using a literal. One might paraphrase:
>>
>> "The first rule of identifier club is that there is no way to talk about
>> identifiers"
>>
>> Cheers,
>> Simeon
>>
>>
>> On 2/19/19 5:32 AM, Svensson, Lars wrote:
>> > On Tuesday, February 19, 2019 9:49 AM, Adrian Pohl wrote:
>> >
>> >> On 19.02.19 04:03, Dan Scott wrote:
>> >>
>> >>> In a linked data context, I think that forcing a URI to be
>> >>> represented as a literal (with a blank node as a bonus), instead of as
>> >>> the URI it is, is an anti-pattern.
>> >>
>> >> I agree, but as I pointed out in the last email I also think that it is
>> >> bad practice to use an URI when you are talking _about_ the URI (like
>> it
>> >> is bad practice to not add quotations when you are talking about a word
>> >> in a written sentence).
>> >
>> > I tend to agree with Adrian here: We're talking about the identifier as
>> a sequence of characters.
>> >
>> >> But there is a third option, we should definitely consider: In my
>> >> opinion the best approach is to only use non-URI identifiers in a
>> >> bf:identifiedBy statement so that the question does not come up. In the
>> >> case that you have different URIs denoting the same resource it
>> probably
>> >> is best practice to use schema:sameAs or something similar to state
>> that
>> >> those URIs refer to the same thing.
>> >
>> > Here I tend to disagree with Adrian: We should not limit ourselves to
>> non-URI identifiers.
>> >
>> > I'm also not quite happy with the use of schema:URL (what if we use
>> IRIs?). My preferred pattern would be to use dct:type to say what kind of
>> identifier it is and have a set of skos:Concepts to represent the
>> identifier types. (I know, the definition of dct:type says that the
>> rdfs:range is rdfs:Class, but I _think_ that the DCMI Usage Board currently
>> is working on relaxing that to
>> >
>> > dct:type a rdf:Property ;
>> > schema:rangeIncludes rdfs:Class .
>> > ) [1].
>> >
>> > That way we'd get:
>> >
>> > @prefix bf: <http://id.loc.gov/ontologies/bibframe/> .
>> > @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
>> > @prefix dct: <http://purl.org/dc/terms/> .
>> > @prefix skos: <http://www.w3.org/2004/02/skos/core#> .
>> >
>> > <http://example.org/2335409#Work> a bf:Text, bf:Work ;
>> > bf:identifiedBy [ a bf:Identifier ;
>> > dct:type bf:URI ;
>> > rdf:value "http://worldcat.org/entity/work/id/638612"
>> > ] .
>> >
>> > bf:URI a skos:Concept .
>> >
>> > [1]
>> https://github.com/dcmi/usage/blob/master/minutes/2018/2018-11-20.dcub-decisions.md
>> >
>> > Best,
>> >
>> > Lars
>> >
>>
>>